I wonder if they can sense my unease at that level of surveillance
A black hat hackers wet dream. In just one square kilometer, you can have a 1M+ botnet.
I help run a bunch of gear in a data centre, and all of our IoT stuff (PDUs, cooling) don't have gateways to the public Internet. They're on a segmented VLAN/subnet which you have to contact through a jump box: no routing anywhere else.
> The office network at Xiong’an NGN Lab, a test case from the wider city, includes export routers, core switches, and network interconnection systems (NAT64+ALG), all deployed in a dual-stack environment. Office computers and OA servers operate in an IPv6-only area and communicate with external IPv4 network nodes through network protocol translation equipment and the interconnection system.